from datetime import datetime

with open('test.txt', 'w') as f:
	f.write('今天是 ')
	f.write(datetime.now().strftime('%Y-%m-%d'))

with open('test.txt', 'r') as f:
	s = f.read()
	print('open for read...')
	print(s)

with open('test.txt', 'rb') as f:
	s = f.read()
	print('open as binary for read...')
	print(s)